Finding the Third Proportional to 12,658.78 and 18,988.17

Step by Step Solution

1. Step 1: Write the proportion equation
   12,658.78 : 18,988.17 = 18,988.17 : x
2. Step 2: Convert to fraction form
   12,658.78/18,988.17 = 18,988.17/x
3. Step 3: Cross multiply
   12,658.78x = 18,988.17 × 18,988.17
4. Step 4: Simplify right side
   12,658.78x = 360,550,671.15
5. Step 5: Solve for x
   x = 360,550,671.15/12,658.78
6. Step 6: Final answer
   x = 28,482.26